A comprehensive survey on the research status and latest progress is performed on the implicit human-computer interaction. First, the research background is summarized and analyzed from the aspects of the domestic and international research institutes, research characteristics, and related resources in this area. Second, theories and technologies relevant to this area are elaborated. The mainstream algorithms are summarized, classified, and compared. Finally, research difficulties, hotspots, and future trends are discussed, in addition to the forecast of future development.